Buffer overflow in QuickTime in Apple OS X before 10.10 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via crafted audio samples in an m4a file.
https://support.apple.com/kb/HT6535
https://support.apple.com/kb/HT6493
https://exchange.xforce.ibmcloud.com/vulnerabilities/97626
http://www.securitytracker.com/id/1031065
http://www.securityfocus.com/bid/70643
http://archives.neohapsis.com/archives/bugtraq/2014-10/0101.html